0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

# A man is rowing a boat upstream but, the boat is found to be not moving with respect to the bank. The work done by the man w.r.t. the ground is:zeromay be positive or negativepositivenegative

A
zero
B
negative
C
may be positive or negative
D
positive
Solution
Verified by Toppr

#### In physics, work is said to be done, if a force acting on a body is able to move the body through some distance in the direction of the force.Here, the boat is not moving with respect to the bank and hence the work done by the man is zero.

2
Similar Questions
Q1
A man is rowing a boat upstream but, the boat is found to be not moving with respect to the bank. The work done by the man w.r.t. the ground is:
View Solution
Q2
A man of mass m runs without sliding from rest from one end of a boat of mass M and length l with an acceleration a relative to the boat. If the friction between water and boat is neglected, find the
a) acceleration of CM of the system (M+M)
b) acceleration of the man and boat
c) position of man at the time when he reaches to other end of the boat
d) frictional force
e) work done by friction
f) total work done by friction
g) velocities of man and boat when the man reaches other end of the boat.
h) work done by man.

View Solution
Q3
A man rows a boat a certain distance upstream and then returns to the same place. If the time taken by him in going upstream is twice the time taken in rowing downstream, find the ratio of the speed of the boat in still water and the speed of the stream.
View Solution
Q4
A man rows a boat upstream a certain distance and then returns back to the same place. If the time taken by him in going upstream is twice the time taken in rowing downstream, find the ratio of the speed of the boat in still water and the speed of the stream.
View Solution
Q5
A boat man could row his boat with a speed 10 m/sec. He wants to take his boat from P to a point Q just opposite on the other bank of the river flowing at a speed 4 m/sec. He should row his boat–

View Solution